Fear (Gone Book #5), Michael Grant

Night is falling in the FAYZ. Permanently.

The gaiaphage has blotted out the sun and the barrier that surrounds the town of Perdido Beach is turning black. It’s Sam’s worst nightmare. With Astrid still missing and Edilio and Lana struggling to maintain order, Sam and his followers need all the courage they can get.

As their world descends into darkness, only real heroes will survive. The GONE series is Lord of the Flies for the 21st century. In turns breathtaking, harrowing, and utterly terrifying.